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Climate change and invasive species: a physiological performance comparison of invasive and endemic bees in Fiji

da Silva, Carmen R.B. and Beaman, Julian E. and Dorey, James B. and Barker, Sarah J. and Congedi, Nicholas C. and Elmer, Matt C. and Galvin, Stephen and Tuiwawa, Marika and Stevens, Mark I. and Alton, Lesley A. and Schwarz, Michael P. and Kellermann, Vanessa (2021) Climate change and invasive species: a physiological performance comparison of invasive and endemic bees in Fiji. Journal of Experimental Biology, NA . NA. ISSN 0022-0949

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Anthropogenic climate change and invasive species are two of the greatest threats to biodiversity, affecting the survival, fitness and distribution of many species around the globe. Invasive species are often expected to have broad thermal tolerances, be highly plastic, or have high adaptive potential when faced with novel environments. Tropical island ectotherms are expected to be vulnerable to climate change as they often have narrow thermal tolerances and limited plasticity. In Fiji, only one species of endemic bee, Homalictus fijiensis, is commonly found in the lowland regions, but two invasive bee species, Braunsapis puangensis and Ceratina dentipes, have recently been introduced to Fiji. These introduced species pollinate invasive plants and might compete with H. fijiensis and other native pollinators for resources. To test whether certain performance traits promote invasiveness of some species, and to determine which species are the most vulnerable to climate change, we compared the thermal tolerance, desiccation resistance, metabolic rate, and seasonal performance adjustments of endemic and invasive bees in Fiji. The two invasive species tended to be more resistant to thermal and desiccation stress than H. fijiensis, while H. fijiensis had greater capacity to adjust their CTMAX with season, and H. fijiensis females tended to have higher metabolic rates, than B. puangensis females. These findings provide mixed support for current hypotheses for the functional basis of the success of invasive species, however, we expect the invasive bees in Fiji to be more resilient to climate change due to their increased thermal tolerance and desiccation resistance.

Item Type: Journal Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Geography, Earth Science and Environment
Faculty of Science, Technology and Environment (FSTE) > Herbarium
Depositing User: Stephen Galvin
Date Deposited: 13 Jan 2021 03:15
Last Modified: 13 Jan 2021 03:15

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